Saddle up your favorite saurian steed and grab your trusty TW six shooter because it is time to move' em out. The Rex Ranch and Aviary is getting ready to drive their herd of Brontosaurus to market, but recent frontier reports of Simvan Monster Riders have got rancher Gustavson a little worried, so he has called in Demon Busters Expeditionary Force: Delta for a little insurance. Will they be up to the challenge of guarding a herd of dinosaurs from the dangers of the wild west, or will this be just another Bug Hunt?